Scenes: nameplates canvas + name field wiring in Main, The Room cubemap churn

- Main: PlayerNameplates overlay canvas (sorting 110) with NameLabel
  template (bottom-aligned) and CanvasScaler (scale w/ screen size,
  1920x1080, expand); PlayerNameField on the session player panel
- The Room: regenerated SkyboxReflection cubemap fileID churn

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

Assets/Scenes/The Room.unity

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---- !u!89 &1263421995
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